Pressure swing adsorption device and rotary valve thereof

A rotary valve comprising:

• a valve body provided with a first group of flow channels, a second group of flow channels, and a third group of flow channels, wherein ports of the first group of flow channels, ports of the second group of flow channels, and ports of the third group of flow channels are disposed on a surface of the valve body, the valve body is a cylindrical structure and defines a rotation axis extending along a vertical direction;
• and
• a valve sleeve sleeved coaxially hermetically outside the valve body along the rotation axis, wherein the valve sleeve comprises a plurality of through-holes, and an inner end of each through-hole is provided with a vertical groove extending up and down along an inner wall of the valve sleeve, the vertical groove is divided into three sections along the vertical direction, which communicate with the ports of the first group of flow channels, the ports of the second group of flow channels, and the ports of the third group of flow channels, respectively,
• wherein the first group of flow channels are always in a working state, a switching valve is provided at each of the plurality of through-holes, and the switching valve switches one of the second group of flow channels and the third group of flow channels into the working state,
• the valve body rotates around the rotation axis relative to the valve sleeve, so that the plurality of through-holes communicate with the ports of the one of the second group of flow channels and the third group of flow channels that is in the working state and the first group of flow channels by means of a predetermined combination to carry out a plurality of process sequences, and each through-hole communicates with ports of the first group of flow channels, and one of the second group of flow channels and the third group of flow channels.